GRE TOEFL IELTS colossal Definition Extremely large in size, scale, or degree. Example "The discovery was a colossal breakthrough for modern medicine." Sign in to save GRE Quiz → TOEFL Quiz → IELTS Quiz → ← colony colt → Study tips featuring "colossal" Audit Your Own Writing to Find Gaps Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct